CN113040794A - Dual-energy subtraction quick implementation method and system - Google Patents
Dual-energy subtraction quick implementation method and system Download PDFInfo
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- CN113040794A CN113040794A CN202011618286.1A CN202011618286A CN113040794A CN 113040794 A CN113040794 A CN 113040794A CN 202011618286 A CN202011618286 A CN 202011618286A CN 113040794 A CN113040794 A CN 113040794A
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- 230000005540 biological transmission Effects 0.000 description 2
- 238000004422 calculation algorithm Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/44—Constructional features of apparatus for radiation diagnosis
- A61B6/4476—Constructional features of apparatus for radiation diagnosis related to motor-assisted motion of the source unit
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/54—Control of apparatus or devices for radiation diagnosis
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/54—Control of apparatus or devices for radiation diagnosis
- A61B6/542—Control of apparatus or devices for radiation diagnosis involving control of exposure
Abstract
The invention relates to a method and a system for quickly realizing dual-energy subtraction, wherein the method comprises the following steps: s1, initializing a flat panel detector and a high voltage generator; s2, the software control module sends a script command to the flat panel detector, and simultaneously, the software control module also sends a synchronous signal to the high-voltage generator; s3, after the software control module receives the synchronous signal, the high voltage generator will continuously execute two times of exposure operation; s4, the software control module informs the flat panel detector to execute a script command, the flat panel detector collects and generates three images, stores the three images in a corresponding ram space and transmits the three images to an upper computer for storage and processing, and the method reduces the number of high-voltage generators to one, and increases a synchronous signal and a software handshake signal between the flat panel detector and the high-voltage generator, so that the contrast of the two images after exposure subtraction can be enhanced; the script command file in the method can reduce the whole plotting time and avoid the leakage current phenomenon.
Description
Technical Field
The invention relates to the technical field of X-ray, in particular to a method and a system for quickly realizing dual-energy subtraction.
Background
The digital image is essentially a digital array of combinations that can be used to perform algorithmic operations on different digital arrays. The current digital subtraction technology has two types, one is time subtraction, and the other is energy subtraction. The dual-energy subtraction double energy reconstruction (DES) is a method in which X-rays with certain energy are projected to different tissues of a human body and reflected to a receiving system (tissue structure imaging), and the definition of images is different. At present, there are two kinds of DES methods commonly used, one is a fast high-low energy double exposure represented by GE corporation in usa, and the other is a single exposure performed by fuji corporation in japan with a filter plate interposed between two receivers. The existing DES technology is applied to X-ray generators, bulbs and flat panel detectors of two exposures in a DR (digital radiography) system, so that the requirements of the X-ray generators, the bulbs and the flat panel detectors are high, namely 3 images, namely a high kv, a low kv and a reference image, need to be generated in a short time, and then image subtraction operation is carried out to obtain energy values (the high kv is subtracted from the reference image, and the low kv is subtracted from the reference image) of the two images after comparison and subtraction, so that corresponding problems of different tissue structures are positioned or judged. Kv herein denotes the unit of the amount of X-ray energy;
in the traditional DES method, two high voltage generators are directly connected to a flat panel detector, as shown in fig. 1, the frame frequency of exposure mapping completely depends on the single exposure time of the two high voltage generators and the integration time of the flat panel detector (the integration time refers to the time for opening a gate control signal inside the flat panel, opening a gate control switch and collecting X-rays), for example, the exposure time of the high voltage generator is 16ms, the gate control signal opening time of the flat panel detector is 32us, the whole integration time is 30ms, the time for completing one mapping is 0.75s, the frame frequency of the flat panel detector is relatively fixed, the exposure time of the high voltage generator is limited, and cannot be synchronized with the flat panel detector, the delay time for obtaining two mapping cannot be fixed, resulting in that the whole DES consumes more time, the leakage current phenomenon is obvious (the leakage current phenomenon is due to the fact that in the mapping process, the gate control switch is turned on, so that the photodiode can lose electronic signals at variable time, the scanning time is increased, particularly after a large amount of X-rays are not detected after 10s, the TFT has loss defects when collecting the electronic signals, and finally, the generated image has partial black spots, high noise and poor image effect, and the contrast of the image is not high (the contrast refers to the contrast after subtracting two images acquired by exposure under different kv conditions and a reference image under the same hardware environment).
Disclosure of Invention
The invention aims to solve the technical problem of providing a quick dual-energy subtraction realization method which is less in time consumption, can avoid the occurrence of a current leakage phenomenon and can improve the picture contrast.
The invention adopts the technical scheme that a quick dual-energy subtraction realization method comprises the following steps:
s1, electrifying the flat panel detector and the high-voltage generator, opening an upper computer console and a software control module, completing the configuration of the flat panel detector and the high-voltage generator, initializing the flat panel detector and the high-voltage generator, and completing the interconnection work among the upper computer, the flat panel detector and the high-voltage generator;
s2, the software control module sends a script command to the flat panel detector, the script command comprises an image acquisition command for continuously acquiring three images and a flat panel refreshing command, and meanwhile, the software control module also sends a synchronous signal to the high voltage generator;
s3, after the software control module receives the synchronous signal, the high voltage generator will continuously execute two times of exposure operation, and after the exposure is finished, an exposure finished mark is returned to the software control module;
and S4, after receiving the exposure completion mark, the software control module informs the flat panel detector to execute a script command, and the flat panel detector collects and generates three pictures, stores the three pictures in a corresponding ram space and transmits the three pictures to an upper computer for storage and processing.
The invention has the beneficial effects that: by adopting the method for quickly realizing the dual-energy subtraction, the number of the high-voltage generators is reduced to one, and the synchronous signals and the software handshake signals between the flat panel detector and the high-voltage generators are increased, so that the contrast of the image subjected to subtraction of two exposures can be enhanced; the method adds the script command file which integrates the image acquisition command and the flat panel refreshing command into one script file, so that the whole drawing time can be reduced and the leakage current phenomenon can be avoided.
Preferably, the specific steps of generating three images by the flat panel detector acquisition are as follows:
(1) before executing the script command, configuring an AD chip time sequence in the flat panel detector, and selecting an optimal working mode, namely a dual-channel working mode;
(2) setting a low-pass filter register in the flat panel detector, and opening each path of photosensitive diode switch and opening a gate control signal;
(3) and the software control module issues a script command to the flat panel detector, and the flat panel detector executes the image acquisition operation.
In the step (1), the working mode of the AD chip in the flat panel detector is set to be a dual-channel mode, so that the scanning time of each picture is doubled, and the time consumption of the picture acquisition process is low. In the step (2), a low-pass filter register is arranged, so that the noise problem caused by rapid image acquisition can be reduced, and the phenomenon of current leakage when a second exposure image is acquired can be avoided by opening a photosensitive diode and a gating signal.
The utility model provides a dual-energy shadow-reducing realizes system fast, includes the host computer, with the picture device of gathering of host computer connection and with the emitter of host computer connection, the host computer includes high-pressure generator control cabinet and software control module, and the picture device of gathering is a flat panel detector, and emitter is a high-pressure generator, the host computer opens high-pressure generator through the control cabinet, and software control module lets flat panel detector accomplish through executing script command file and gathers the picture function.
By adopting the dual-energy shadow-reducing quick-realization system, the bottleneck of continuous twice light exposure time of the high-voltage generator is overcome, the problem of synchronization of the high-voltage generator and a flat panel detector is solved, and two exposure image acquisition with small noise is quickly completed.
Drawings
FIG. 1 is a schematic diagram of a dual-energy subtraction system according to the prior art;
FIG. 2 is a schematic structural diagram of a dual-energy subtraction fast implementation system according to the present invention;
FIG. 3 is a timing diagram of the high voltage generator and flat panel detector of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings in combination with specific embodiments so that those skilled in the art can practice the invention with reference to the description, and the scope of the invention is not limited to the specific embodiments.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must be in a particular orientation, constructed and operated in a particular orientation, and thus the above terms are not to be construed as limiting the present invention.
When the flat panel detector executes the image acquisition operation, due to the limitation of the exposure time of the high voltage generator, the conventional image acquisition method is very difficult to meet the requirement of continuously exposing two images, for example, after the flat panel detector acquires one image time X being 0.75s (the read-write time of one image is 0.75s), and runs the image algorithm twice (namely, subtracting the reference image from the high kv and subtracting the reference image from the low kv), the image algorithm is uploaded and stored to the corresponding ram address, at least, Y being 5 being 0.75s and 5 being 3.75s are required, the three-image script command operation time Z being 0.6s, and the total image acquisition time Q being Y + Z being 4.35 s. The high voltage generator needs to continuously execute two exposure operations, the X-ray throwing time is P equal to 16ms, M equal to 1S is also needed the fastest from starting to executing a series of switch operations, the time delay waiting time N equal to 500ms is added between the first exposure command and the second exposure command, the total exposure time S equal to (M + P) × 2+ N equal to (1S +0.016) × 2+ 0.5 equal to 2.532S is added, that is, before the high voltage generator completes the continuous two exposure operations, the flat panel detector must complete the drawing operation of subtraction of two drawings, that is, Q must be less than S, so the traditional drawing method is difficult to satisfy the DES function completed by one high voltage generator.
The invention relates to a fast realization method of dual-energy subtraction shadow, which overcomes the bottleneck of continuous twice light exposure time of a high-voltage generator, solves the problem of synchronization of the high-voltage generator and a flat panel detector, and rapidly finishes the acquisition of two exposure images with very small noise, and comprises the following steps:
s1, electrifying the flat panel detector and the high-voltage generator, opening an upper computer console and a software control module, completing the configuration of the flat panel detector and the high-voltage generator, initializing the flat panel detector and the high-voltage generator, and completing the interconnection work among the upper computer, the flat panel detector and the high-voltage generator, wherein the hardware structure of the flat panel detector and the high-voltage generator is shown in FIG. 2;
s2, the software control module sends a script command to the flat panel detector, the script command comprises an image acquisition command for continuously acquiring three images and a flat panel refreshing command, and meanwhile, the software control module also sends a synchronous signal to the high voltage generator;
s3, after the software control module receives the synchronous signal, the high voltage generator will continuously execute two times of exposure operation, and after the exposure is finished, an exposure finished mark is returned to the software control module;
s4, after receiving the exposure completion mark, the software control module informs the flat panel detector to execute a script command, and the flat panel detector collects and generates three pictures, stores the three pictures in a corresponding ram space and transmits the three pictures to an upper computer for storage and processing;
the method comprises the following specific steps of acquiring and generating three images by using a flat panel detector:
(1) before executing the script command, configuring an AD chip time sequence in the flat panel detector, and selecting an optimal working mode, namely a dual-channel working mode;
(2) setting a low-pass filter register in the flat panel detector, and opening each path of photosensitive diode switch and opening a gate control signal;
(3) the software control module issues a script command to the flat panel detector, and the flat panel detector executes the image acquisition operation;
(4) performing a series of operations such as image subtraction operation and data transmission in the flat panel detector;
(5) and after receiving the image, the upper computer performs the operations of dead pixel operation, inspection processing and the like.
The DES rapid implementation method can overcome the bottleneck of exposure time of the high-voltage generator, avoid the leakage current phenomenon, and optimize the image noise problem. Compared with the traditional method for realizing the DES function, the method mainly makes the following improvements:
firstly, the working mode is set into a dual-channel mode, the scanning time of each image is doubled, and the LPF is added to reduce the noise problem caused by rapid image production.
And secondly, the high-voltage generator is reduced to one, and an external synchronizing signal and a software handshake signal are added to enhance the contrast of the image after the subtraction of the two exposures.
And thirdly, a script command file is added, and an image acquisition command and a flat refreshing command are integrated into one script file to reduce the whole drawing time and avoid the leakage current phenomenon.
The invention relates to a dual-energy subtraction fast realization method, which mainly improves the time for acquiring a picture by a flat panel detector, namely, the time for acquiring the picture by the flat panel detector is reduced to X0.37S, the running time of a script command is shortened to Z0.4S, namely, the total time for acquiring the picture Q is Y + Z5 + Z0.37 + 5+0.4 is 2.25S, which is less than the total time for exposing S2.532S.
For example, the total sampling scan time of the present invention is Q ═ Y + Z ═ 0.37 × 4 (two exposures minus fig. 1.48S) + X (see fig. 0.37S) + Z (script run time 0.4S) ═ 1.48+0.37+0.4 ═ 2.25S ═ M + Z ═ 2+ N ═ 2+ 0.016 ═ 2+ 0.5 ═ 2.532S (two exposures plot time). And finally, verifying that the method can be normally realized through multiple image acquisition.
As shown in fig. 2, a dual-energy subtraction rapid implementation system comprises an upper computer, a drawing acquisition device connected with the upper computer and a transmitting device connected with the upper computer, wherein the upper computer comprises a high-voltage generator console and a software control module, the drawing acquisition device is a flat panel detector, the transmitting device is a high-voltage generator, the upper computer opens the high-voltage generator through the console, and the software control module enables the flat panel detector to complete the drawing acquisition function through executing a script command file.
In fig. 3, the time sequence logic of the high voltage generator and the panel mapping is mainly described, that is, after the high voltage generator receives the synchronization signal, the bulb tube is operated at high speed, and a large amount of X-rays are thrown, which is equivalent to that the bulb tube is in an exposure state at this time; the interior of the flat panel detector can be opened to enable a gating signal to execute a script file to enter a picture collecting process, after the exposure process is finished by the high-voltage generator, a delay process with a certain time is arranged in the middle, and during the delay, the interior of the flat panel can be refreshed and charged regularly to wait for the next exposure.
The high voltage generator in the invention refers to a system device which can generate a large amount of X-rays; the related flat panel detector is a carbon fiber plate, a Thin Film Transistor (TFT) with an AD chip, a support plate and a signal processing plate are arranged in the flat panel detector, wherein the signal processing plate mainly converts X photoelectron signals collected by the photosensitive diode into digital signals through the AD chip, and then generates corresponding pictures through a series of data storage, transmission and processing;
finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that various changes and modifications may be made to the embodiments described in the foregoing embodiments, or equivalent changes and modifications may be made to some of the technical features of the embodiments without departing from the spirit and scope of the embodiments of the present invention.
Claims (3)
1. A dual-energy subtraction rapid implementation method is characterized by comprising the following steps: the method comprises the following steps:
s1, electrifying the flat panel detector and the high-voltage generator, opening an upper computer console and a software control module, completing the configuration of the flat panel detector and the high-voltage generator, initializing the flat panel detector and the high-voltage generator, and completing the interconnection work among the upper computer, the flat panel detector and the high-voltage generator;
s2, the software control module sends a script command to the flat panel detector, the script command comprises an image acquisition command for continuously acquiring three images and a flat panel refreshing command, and meanwhile, the software control module also sends a synchronous signal to the high voltage generator;
s3, after the software control module receives the synchronous signal, the high voltage generator will continuously execute two times of exposure operation, and after the exposure is finished, an exposure finished mark is returned to the software control module;
and S4, after receiving the exposure completion mark, the software control module informs the flat panel detector to execute a script command, and the flat panel detector collects and generates three pictures, stores the three pictures in a corresponding ram space and transmits the three pictures to an upper computer for storage and processing.
2. The method for rapidly realizing dual-energy subtraction according to claim 1, wherein: the method comprises the following specific steps of acquiring and generating three images by using a flat panel detector:
(1) before executing the script command, configuring an AD chip time sequence in the flat panel detector, and selecting an optimal working mode, namely a dual-channel working mode;
(2) setting a low-pass filter register in the flat panel detector, and opening each path of photosensitive diode switch and opening a gate control signal;
(3) and the software control module issues a script command to the flat panel detector, and the flat panel detector executes the image acquisition operation.
3. A system for realizing the quick realization method of the dual-energy subtraction is characterized in that: the device comprises an upper computer, a drawing collecting device connected with the upper computer and a transmitting device connected with the upper computer, wherein the upper computer comprises a high-voltage generator control console and a software control module, the drawing collecting device is a flat panel detector, the transmitting device is a high-voltage generator, the upper computer opens the high-voltage generator through the control console, and the software control module enables the flat panel detector to complete the drawing collecting function through executing a script command file.
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2020
- 2020-12-31 CN CN202011618286.1A patent/CN113040794A/en active Pending
Patent Citations (7)
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| US20030086531A1 (en) * | 2001-11-08 | 2003-05-08 | Rader Amber E. | Multiple energy x-ray imaging techniques |
| CN101868836A (en) * | 2007-11-19 | 2010-10-20 | 皇家飞利浦电子股份有限公司 | A radiation detector comprising an imaging radiation-collimating structure |
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Application publication date: 20210629 |